Danny Willett smashes putter he used to win the Masters at Oakmont

"Unfortunately it's now in two pieces."

Danny Willett admitted frustration got the better of him after smashing the putter he used to win the Masters during the US Open at Oakmont.

A closing 71 left the 28-year-old on nine over par alongside Argentina's Angel Cabrera, who was five over par in winning the US Open at Oakmont in 2007.